The reliability of engine valve springs is a very important issue from the point of view of warranty. This paper presents a combined experimental and statistical analysis for predicting the fatigue limit of high tensile engine valve spring material in the presence of non-metallic inclusions. Experimentally, Fatigue tests will be performed on valve springs of high strength material at different stress amplitudes. A model developed by Murakami and Endo, which is based on the fracture mechanics approach, Extreme value statistics (GUMBEL Distribution) and Weibull Distribution will be utilized for predicting the fatigue limit and the maximum inclusion size from field failures. The two approaches, experimental and theoretical, will assist in developing the S-N curve for high tensile valve spring material in the presence of non-metallic inclusions.
Analyzing Field Failures of Engine Valve Springs in Presence of Non Metallic Inclusions by Applying Statistical and Fracture Mechanics Models
Sae Int. J. Mater. Manf
Sae International Journal of Materials and Manufacturing
SAE World Congress & Exhibition ; 2009
Sae International Journal of Materials and Manufacturing ; 2 , 1 ; 265-273
2009-04-20
9 pages
Aufsatz (Konferenz)
Englisch
Study of the Fatigue Failure of Engine Valve Springs Due to Non-Metallic Inclusions
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